PolyhedralGeometry: Document IncidenceMatrix feature for maximal_* functions

[lkastner]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.83%. Comparing base (7e5d14d) to head (c545f43).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3854      +/-   ##
==========================================
+ Coverage   81.77%   81.83%   +0.06%     
==========================================
  Files         580      581       +1     
  Lines       79856    80009     +153     
==========================================
+ Hits        65299    65473     +174     
+ Misses      14557    14536      -21     

Files	Coverage Δ
...PolyhedralGeometry/PolyhedralComplex/properties.jl	86.27% <ø> (ø)
src/PolyhedralGeometry/PolyhedralFan/properties.jl	98.33% <ø> (ø)
...lyhedralGeometry/SubdivisionOfPoints/properties.jl	86.66% <ø> (ø)

... and 20 files with indirect coverage changes